SOLVED (my post just before)
was a very simple error: my devx_421.sfs file was corrupt, it weights 55M instead of 77M..
that was the cause of error message :
#mount -o loop devx_421.sfs /data
mount: you must specify the filesystem type

1) Put Devx file in root folder of hard drive
2) Start live pfix=ram session
3) Reboot saving as a puppy save file.
4) Boot into new session and choose to load devx by putting it in right hand pane when prompted.
5) Remaster live CD

Boot using this CD and perform a full HDD install and devx will be intergrated properly.

I'm using a full install of puppy 431 on sda4 and this thread is the only thing that helped me install the devx module. I have a frugal install on sda1 and I was able to load it through the boot manager as it should. Why doesn't the boot manager allow us to load any sfs file in any location whether the install is frugal or full? I hope that gets fixed in the future, but as for now I have it working.

I tried doing it without "--remove-destination" and it froze my whole system on the next reboot. It's important!

Tried using that to mount devx_431 under a fresh hard drive install of puppy 4.3.1. It mounted successfully but upon reboot (with devx still 'installed' or symlinked in the mount at boot folder) the kernel would fail to detect my CD-ROM drive and Xorg would no longer start. When devx is 'uninstalled' or removed from the boot folder it doesn't give this error.

I'd say some files are conflicting but I'm not that interested in tracking them down given that the manual method described earlier works like a charm.

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